Electric-switch control.



W. M. SCOTT. ELECTRIC SWITCH CONTROL.

APYLIOATIOH TILED MAB. B, 1912.

Patented Apr. 8, 1913.

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ELECTRIC SWITCH CONTROL.

APPLICATION FILED MAE. 8, 1912. 1,058,200. Patented Apr. 8, 1913.

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W. M. SCOTT.

ELECTRIC SWITCH CONTROL. APPLIOATXON FILED MAB.8, 1912.

1,058,200. Patented Apr. 8, 1913.

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WILLIAM M. SCOTT, OF BERWYN, PENNSYLVANIA.

ELECTRIC-SWITCH CONTROL.

Specification of Letters Patent.

Patented Apr. 8, 1913.

Application filed March 8, 1912. Serial No. 682,506.

To all whom z't may concern Be it known that I, WILLIAM M. Soorr, acitizen-of the United States, residing in Berwyn, in the county ofChester and State of Pennsylvania, have invented a new and usefulElectric-Switch Control, of which the following is a specification.

My invention relates to electric switch or circuit breaker mechanism,and more particularly to a switch or circuit breaker mechanism inassociation with a system or apparatus whereby the switch or circuitbreaker will not repeatedly alternately move toward closed and openpositions during the con tinuance of the electrical condition inresponse to which it first opened or in virtue of which it should remainopen if such condition continues.

My invention resides also in a switch or circuit breaker comprisingelectro-responsive means and means for mechanically holding the switchor circuit breaker in normal position, the elect-ro-responsive meansthereafter releasing the same from mechanical control and itselfcontrolling a switch or circuit breaker.

My invention resides in the features hereinafter described and claimed.

For an illustration of one of the forms my invention may take, referenceis to be had to the accompanying drawings in which:

Figure 1, is a side elevational view, partly in section, showing acircuit breaker and associated control parts. Fig. 2, is a frontelevational view of the same. Fig. 3, is a side elevational view, onenlarged scale, of one of the control switches. Fig. 4, is a sideelevational view, partly in sect-ion, of a control switch or circuitbreaker. Fig. 5, is a front elevational view of the same. Fig. 6, is adiagram showing the electrical circuits and parts controlled thereby.Fig. 7, is a side view of a member of the control switch or breaker.Fig. 8, is a side view of a cooperating member of the control switch orbreaker. Fig. 9 is a fragmentary front elevational view of the lowerparts of the members shown in Figs. 7 and 8 in cooperating position.

Referring to the drawings, upon a base or switchboard 1 of insulatingmaterial, such as marble or the like, are mounted the main terminalblocks 2 and 3 of the main switch or circuit breaker. These terminals 2and 3 are adapted to be bridged by the member 4 representing a laminatedbridging member which is secured to the arm 5 pivoted to the housing 6and 7.

8 is a movable intermediate metallic shunt contact adapted to engage theintermediate stationary metallic shunt contact 9. The

- movable shunt carbon contact 10, carried by the arm 5 with the contact8, engages the stationary shunt carbon 11. Wherrthe main switch orbreaker opens, the bridging member 4 first separates from the mainterminals 2 and 3, thereafter the intermediate metallic shunt contact 8separates from stationary contact 9 and finally the carbon contact l0separates from the carbon contact 11, the final arcing due to rupture ofcircuit occurring between the carbons 10 and 11.

Pivoted'to the arm 5 at 12 is a link 13 pivoted at 14 to the extension15 integral with the link 16 pivoted to the housing 6 at 17. The links13 and 16 form a toggle which, in the circuit closing position shown inFig. 1, is slightly overtraveled. To the link 16 there is pivoted at 18the rod 19 having at its lower end the slot 20 in whichis movable thepin 21 carried by the lever 22 pivoted at 23 to the link 24 which ispivoted at 25 upon a lug on the jacket'or housing 26 of a solenoid whosewinding is indicated in section at 27 and which has a vertically movablecore 28 pivoted at 29 to the lever or arm 22. The housing or jacket 26of the solenoid is secured upon the base 1.

Upon the front of the housing 26 is a projection 30 under the lower edgeof which is adapted to engage the lug 31 on the rod 19, the lug 30 thuslimiting the upward travel of the rod 19 which in consequence preventsthe toggle 13, 16 overtraveling too far. Pivoted to the lever 22 at 32is a lever 33 having a stop 34 limiting its countercloc wise rotation onthe pivot 32. A stop 35 secured to the housing 26 limits the clockwiserotation of lever 33 upon pivot 32. A spring 36 is attached at one endto the lever 33 and at its other end to the housing 26. At its endopposite pivot 32 the lever 33 carries two contact rollers 37, 37, inelectrical communication with each other and adapted to engage thestationary contact springs 38, 38 secured upon the base 1.

Associated with the lower main terminal 3 are magnet poles 39 adapted tobe magnetized by the current passing through the terminal 3 to attractthe armature t0 supported on member 41 pivoted to the housing 6 at 42.By means of the handle 43 the armature 40 may be adjusted to difierentdistances from the poles 39 so that the armature '40 will not beattracted except upon the current flowing through terminal 3 reachingpredetermined values. The armature 40 carries pin 44 extending throughslot 45 in the housing 6. At its outer end the pin 44 carries the roller46 which, when the armature 40 has been attracted to the position shownin Fig. 3, engages the spring 47 and deflects ittoward the base 1. Thespring 47 is supported by and in electrical communication with thebracket 48 secured upon the base 1 by the bolt 49 which serves also asan electrical connection to the spring 47. At'its' upper end the spring47 carries a roller 50 which, when the armature 40 is not attractedengages the contact r0ller'51 supported by the conducting bracket 52which is secured to the base 1 by bolt 53 which serves also as anelectrical connection to the roller 51.

-At any suitable distance from the switch or breaker shown in Figs. 1and 2 is located a control switch or circuit breaker such as illustratedin Figs. 4 and 5. This switch or circuit breaker comprises a base 54 ofinsulating material upon which is secured an electro-magnet having thecore 55, winding 56 and jacket 57. Disposed in front of theelectro-magnet is the armature 58 having lost motion pivotal connectionat 59 with the arm 60 pivoted at 61 to the bracket 62 upon the jacket orhousing 57. At 63 the latch 64 is pivoted to the arm 60. On the jacket57 is a formed notch 65 which is engaged by the hook latch 64 to holdthe arm 60 in the position shown in Fig. 4 as hereafter described. Thelatch 64 has a lug 65 adapted to be engaged by the lug 66 on thearmature 58. There may be provided on the A latch 64 a weight 67 causingthe latch 64 to engage the notch 65 even in the case where the base 54is horizontal. At its upper end the arm 60 carries a contact roller 68adapted to engage with the contact spring 69 mounted upon the base 54.

Pivoted at 61 on the bracket 62, but independently of the arm 60, is theactuator or operating lever 70 carrying a movable contact 71,electrically connecting through lever or arm 60 with the roller 68. Thismovable contact 71 is adapted to engage with the stationary contact 72secured upon the base 54. On the arm 70 is provided a surface 73 adaptedto engage the lug 74 on the lower end of the arm 60 for limitingcounter-clockwise rotation of arm 70, as viewed in Fig. 4. Wrappedaround the pivot 61 is a spring 75 whose one end engages the arm 60 andwhose other end engages the bracket 62, the tension of the spring beingsuch that it tends to rotate the arm 60 in a clockwise direction on itspivot 61 as viewed in Fig. 4. Between the brackets 62 is a surthatcircuit.

face 73 provided for engaging projection 74 on arm 60 thus limitingoutward or clockwise movement of arm 60 which movement is retarded bythe spring buffers 75.

In Fig. 6, 76 represents one conductor, for example the positiveconductor, of a circuit for supplying the control current; and 77represents the other conductor of A conductor 78 connects c0n ductor 76through conductor 79 with one terminal of the winding 56 whose otherterminal connects by conductor 80 with the stationary contact 72.Connection is made through contact 7 2'with movable contact 71. Thencethrough arms 7 Q and 60 to roller 68 and thence to contact 69 toconductor 81.

Connected across the conductors'79and 81 is the incandescent lamp Lwhich is therefore a connection in parallel with the control switch orcircuit breaker whose magnet winding is 56. The conductor Qt-extendsfrom the control switch or circuit breaker to the more or less distantcircuit breaker,

. shown in Figs. 1 and 2, where conductor 81 connects to terminal 82-01?the winding 27. One stationary contact 38 is connected to terminal 84 ofthe solenoid winding 27. .The other stationary contact 38 connects to anintermediate terminal 83 of the winding 27 and the terminal 84 of thewinding 27 connects by conductor 85 with roller contact 50 which isnormally engaged with roller contact 51 which connects by conductor 86to the other conductor 77 of the circuit supplying the control current.

The operation is as follows: The parts areshown in Figs. 1, 2, and 6 inthe normal or circuit closing position of the main switch or breakerwhose movable contact member is 4 and which switch or circuit breakercon- -trols a circuit carrying lighting, power or any other current. Ifnow it be desired to open the main switch or breaker by an attendantpresent at said switch or breaker, that attendant can do so by actuatingthe armature 40 as through a handle K on pin 44 to cause the roller 46to engage spring 47 to defiect'it toward the base 1 and thereby separatecontact 50 from contact 51. As a result the circuit from conductor 76 toconductor 77 through the solenoid winding 27 is interrupted causing thede'e'nergization of the solenoid whereupon its core 28 will be moveddownwardly by gravity carrying with it the arm or lever 22 which thenrotates about its pivots 23 and 25 in a clockwise direction until thepin 21 strikes the bottom of the slot 20 in the member 19 therebydelivering a blow to the rod 19 which transmits a pull downwardly uponthe link 16 which causes the toggle 13, 16, to move from its slightlyovertraveled position across the dead center position, whereupon itcollapses and the arm 5 rotates in a clockwise direction about itspivot-7 as viewed in Fig.

1, separating the main bridge member 4 from terminals 2 and 3, and insuccession the shunt contacts, thus rupturing the circuit. \Vhen thecontacts 50 and 51 separate, not only is the winding 27 denergized butthe winding 56 at the more or less distant control switch or circuitbreaker is interrupted and electro-magnet 56 is in consequencedeenergized. While the winding 56 was energized it held its armature 58attracted and in consequence the lug 66 engaging the lug 65 held thelatch 64 raised into the dotted line position in Fig. 4, so that the arm60 was held in position only by the attraction upon armature 58. Withthe deenergization of the winding 56 the attraction upon the armature 58ceases and the spring '7 5 rotates the arm 60 in a clockwise directionupon its pivot 61 separating roller 68' from spring 69 and lug 74 comesinto engagement with stop 73, the buffers 7 5 retarding arm 60 in thismovement. When the winding 27 has been denergized and the lever 22 movesas above described it carries the arm 33 with it, and the spring incontracting moves the roller contacts 37 into engagement withstationarycontacts 38. After the main switch or breaker has been trippedby the operator or attendant as above described, the release of thearmature 40 which then takes the position indicated in Fig. 1 allows thereestablishment of contact between contacts 50 and 51. Furthermore, thecircuit of the solenoid 27 has been opened at the distant switch orcircuit breaker whose magnet winding is 56 which, as above described,responds to underload or no-voltage.

It is thus seen that the main switch or breaker will always be trippedin response to either a reduction of current in the control circuitbetween conductor 76 and 77 or to a complete rupture of such circuit. Orthe main switch or circuit breaker may be tripped automatically when thecurrent through it reaches a predetermined value whereupon the armature40 is attracted by the poles 39 causing a similar separation of contact50 from contact 51 with the result in tripping above de scribed.

It is to be understood that while the armature 40 is here shown as anarmature of an overload tripping mechanism, that the contact 50 may beseparated from contact 51 by any other electro-responsive means, as, forexample, by means responsive to reversed current, reversed energy flow,under-load, novoltage, etc. Or the main switch or circuit breaker may betripped at a distance by an operator rotating the handle or operatinglever 70 in a counter-clockwise direction upon its pivot 61 to separatecontact 71 from engagement with contact 72. The separation of contact 71from contact 72 breaks the circuit of solenoid winding 27, which willcause the tripping of the main switch or breaker and hence also thedeenergization of the winding 56 which then causes the opening ofcircuit at 68, 69. With the parts in tion, the main switch or be closedby an operator at the distant control switch or circuit breaker. This isaccomplished by the operator at the distant switch or circuit breakerraising the handle 70, rotating it in a counterclockwise direction aboutpivot 61, the surface 73 engaging the lug 74 and rotating the arm 60with it in a counterclockwise direction about pivot 61, the contact 71being separated from contact 72 before the latch 64 engages the notch65. When the latch 64 engages the notch 65, the circuit of the coil 56is open due to the separation between contacts 71 and 72, conseuentlythe armature 58 has no control over the latch 64. The arm 60 isthen-held by the latch 64 as indicated in Fig. 4' The operator thenreturns the handle 70 to the position shown in Fig. 4 whereupon contact71 again engages contact .7 2 and the circuit through the windings 56and 27 is completed and those windings are energized. Due to theenergizing of winding of 56 armature 58 is attracted as above described,and the latch 64 is disengaged from notch so that the arm 60 is nolonger mechanically held by the latch 64, but is magnetically held bythe armature 58, the latch being then in the p0 sition shown by dottedlines in Fig. 4. But since the winding 27 has been energized, the core28 is attracted upwardly. During the early part of the movement of thecore 28 while contacts 37, 37 are in engagement with contacts 38, 38,that part of the winding 27 between the points 82 and 83 receivescurrent and the part of the winding 27 between the points 83 and 84 isshort circuited, the solenoid then producing the strongest magneticeffect and greatest force upon the core 28. As the core 28 movesupwardly as viewed in Fig. 1, it moves the lever 22 upwardly about itspivots 23 and 25, the pin 21 engaging in the top of the slot 20 andforcing the rod 19 upwardly with the resultant extension of toggle 13,16 which rotates the arm 5 in a counter-clockwise direct-ion about itspivot 7 carrying the movable contacts toward the stationary contacts inthe main switch or circuit breaker. The carbons 1O circuit breaker mayand 11 first engage; then 8 and 9 engage,

and finally the main movable contact 4 engages the stationary terminals2 and 3. In this closing movement the toggle 13, 16 passes slightly overthe dead center position to slightly overtraveled position and isarrested from further movement by the en gagement of the lug 31 with thelug 30. The parts are now in circuit closing position as shown inFig. 1. As the core 28 has moved upwardly in this closing movement, thelever 33 has engaged the stop 35 causing the open circuit posithe lever33 to engage with its stop 34 against the lever 22 with an accompanyingseparation of contacts 37, 37 from 38, 38.-

' The result is that the two parts of the winding 27 are now thrown intoseries with each other so that the resultant current flowing throu h thecircuit between conductors 76 and (7 is reduced, with the consequentsmaller heating effect upon the winding 27 which must remain in circuit.With this change in the path of the currentswitha'espect to the winding27 the ampere turns are reduced, but since the-reluctance of themagnetic circuit has been reduced by the advance of the core 28 themagnetic pull is nevertheless suflicient to complete the closingmovement. Z;

Whenthe'main switch or circuit breaker has been tripped,the'controleswitch or circuit breaker breaks contact'b'etween 68 and 69.as previously described: :The circuit through the winding 27 is, notcompletely interrupted due to the presence'of the lamp L which now burnsbrightly sincethe circuit in shunt to it, including :the winding 56, hasbeen broken. This indicates at the control switch or circuit breakerthat the main switch or circuit has been tripped and the resistance'ofthe lamp L is such that it prevents sufiicient current flowing throughwinding 27 to energize it to thedegree necessary for efiecting theclosing of the main switch or breaker.

If it should be attempted to reclose the main switch or breaker whilethe overload condition (or other electrical condition) still obtains,upon the first engagement of the contacts of the main switch or circuitbreaker the armature 40 will be actuated to separate contact 50 fromcontact 51 thereby interrupting the circuit of the solenoid 27 with theresultant reopening of the main switch or circuit breakernotwithstanding the control switch or circuit breaker has been closed bythe operator. And due to the fact that the contacts 71 and 72 cannot bebrought into engagement with each other, to cause the closing movementof the main switch or circuit breaker, until the handle is moved to sucha position that the energization of magnet 56 will disengage the latch64 from notch 65, it follows that attempted closure of the main switchor circuit breaker during the continuance of the condition in responseto whichit was tripped results in the full opening of the main switch orbreaker and the opening of the control switch or breaker which preventsthe reclosure of the control circuit except in response to actuation ofthe arm 7 O first in a counterclockwise and then in a clockwisedirection about pivot 61. The result is that the main switch or circuitbreaker can never buzz, that is, it cannot rapidly alternately close andopen.

In the core 28 is a counter-bore 87 into which extends the rod 88threaded into the jacket 26 and having the head 89 above which isdisposed the buffer spring -90 which, when the core 28 drops is engagedby the ring 91 secured to the core 28 at the top of the counter-bore 87.

I It is to be understood that my invention is not limited to theovertravel of the toggle or the use of other restraining means forholding the main switch or circuit breaker closed for it is within myinvention to hold the main switch or circuit breaker closed by thesolenoid 27 only, in which case the toggle will not be moved toovertraveled position, and the stops 30, 31 may be omitted. In.-otherwords my invention contemplates the holding of the main switch orcircuit breaker, whether employing a toggle or other contact operatingmeans, closed by the solenoid 27 in" response to whose denergization thecircuit breaker will then open as the core 28 falls It is to beunderstood also that the lamp L may be omitted, and that the position ofthe main switch or circuit breaker is indicated by the position of thecontrol switch or breaker of Fig. 1, since the latter reflects thepositions of the main circuit breaker, since when the maincircuit-breaker is open the control circuit breaker of Fig. 4 is open,andthe main breaker cannot be in closed position unless the controlbreaker is in closed position indicated in Fig. 4:- The lamp however maybe used under certain conditions as such a signal might be desired inaddition to the indication afforded by the position of the controlswitch or breaker.

It is to be understood also that the solenoid 27 instead of beingconstituted of high and low resistance windings as described, may bemade of a single winding with a resistance in series with it, thisresistance to be short circuited when the core 28 is in its lowermostposition, and this resistance may be external to the solenoid, or may bedirectly associated with it and wound noninductivelyf Or the solenoid 27may be made of high and low resistance windings but connectedin,parallel when the core 28 is in its lowermost position, and then thelow resistance section may be open-circuited at the end of the solenoidclosing movement, or a resistance may be thrown into series with suchlow resistance section.

What I claim is:

1. The combination with a switch or circuit breaker, of electro-magneticmeans controlling the same, and a control switch in the circuit of saidelectromagnetic means comprising a movable contact member and anelectro-magnet, and means breaking the circuit of said electro-magnetwhen said movable contact member is moved to normal position.

2. The combination with a movable conswitch in normal position, and

tact member of a switch or circuit breaker, of means for moving saidcontact member to normal position and maintaining the same in normalposition, an electro-motive device when energized actuating said meansand when denergized freeing said contact memher from said means, and acontrolswitch controlling said electro-motive devicecomprising a movablecontact member and an electro-magnet restraining Esaid' contact memberin normal position, I and means breaking the circuit of saidelectro-magnet when said movable contact member of said control switchis moved to normal position.

3. The combination with-a movablecontact membenof a switch or circuitbreaker, of means for moving said contact;member to normal position andmaintainingithe same in normal position, an electroemotiveadevice whenenergized actuating said means and when denergized freeing said movable-contact member from said means,i:-a control switch in the circuit ofsaid-'"electro-motive device comprising restraining the movable contactmembernof said-control switch in normal'positiongiand means fortransferringr the restraint of said movable contact member-of said 1control switch to said electro-magnet.:,

,4. The combinationtwith a .switch oncircuit breaker, ofelectro-fmagnetici means controlling the same, a control switchin thecircuit of said electro-magneticmeans, and means breaking saidcircuitiwhen-said control switchis movedtto normal position.

5. The combination with a switch or circuit breaker, of electro-magneticmeans controlling the same, a controlswitchin the circuit of saidelectro-magnetic means, an electro-magnet restraining said control meansbreaking the circuit of said electro-magnet when said control switchismoved to normal position.

6. The combination with a switch or circuit breaker, ofelectro-magnetic-means controlling the same, a control switch in thecircuit of said electro-magnetic means, a member for moving said switchto normal position, means restraining said switch in normal positionwhen so actuated, an electro-magnet, said member breaking the circuit ofsaid electro-magnet when moving said switch to normal position andrestoring the circuit of said electro-magnet for transferring restraintof said switch to said electro-magnet.

7. The combination witha switch or circuit breaker, of electro-magneticmeans controlling the same, a control switch in the circuit of saidelectro-magnetic means and comprising a movable contact member and anactuator therefor movable independently thereof for moving the same tonormal po a movable contact.mem- "her and an. elcctro-magnet, means forsition, and means for closing said circuit upon reversed movement ofsaid actuator.

8. The combination with a switch or circuit breaker, ofelectro-magnetic' means controlling the same, a control switch in thecircuit of said electro-magnetic means and comprising a movable contactmember .and an actuator therefor for moving the same to normal position,means for closing saidcircuit upn reversed movement of said actuator,and an electro-magnetenergized when said circuit is closed forrestraining said switch. I I

9. The combination with a switch or circuit breaker, ofelectro-magnet'ic means controlling. the same, and a control switch=inthe .circuit of said electro-magnetic means comprisingv a, movablecontact member, a normally energized magnet restraining saidcontactmember in normal position, .an independently; movable actuatorfor; moving said movable contact membento normal position, Landa switchopening the circuit of said=electro-magnet controlled by said actuatorwhen: moving, said movable "contact l member to normal position. 1 Y

l0. ,The'combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, a con-'trol switchv in the circuitv of said electromotive device,anelectro-magnet restraining said switch in normal position, and meansbreakingthe circuit of said electro-magnet when said control switch ismoved to normal position. Y

. 11. The combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, a controlswitch in the circuit of said electromotive device, an electro-magnetrestraining said switch in normal position, means breaking the circuitof said electro-magnet when said control switch is moved to normalposition, and means mechani ally restraining said switch in normalposition until said electro-magnet is energized.

12. The combination with a switch or circuit breaker, of normallyenergized electromagnetic means controlling the same, a control switchin the circuit of said electro magnetic means comprising a movablecontact member and a' normally energized electro-magnet restraining saidmovable contact member, an actuator for moving said movable contactmember to normal position, and a switch interrupting said circuitcontrolled by said actuator when moving said movable contact member tonormal position.

- 13. The combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, saidelectro-motive device included in a normally closed circuit, meansresponsive to deenergization of said electro-motive demovable contactmember of said. control vice for releasing said switch or breaker, acontrol switch having contacts included in said circuit, anelectro-magnet in said circuit, said electro-magnet restraining saidcontrol switch in closed position when said circuit is closed, and meansmechanically restraining said control switch in closed position untilsaid electro-magnet is energized.

14. The combination with a switch or'circuit breaker, ofan'electro-motive device for moving the same to normal" ositi'on; saidelectro-motivedevice included in a normally closed circuit, meansresponsive to deener gization of said electro-motive device forreleasing said switch or-breaker, a control switch having contactsincluded in said circuit, an electr'o magnet in'said circuit,-saidelectro-magnet --restraining said control switch in closedp'osition whensaid'control switch is closed, and means mechanically restraining saidcontrol switch in closed position until said electro-magnet isenergized, and means interrupting said circuit -when said control'switch is mechanically re strained and for closing said circuit totransfer the restraint ofsaid' control switch to said electro-magnet. QI 15. The combination with-'a'switcli or circuit breaker, of normallyenergized-electromagnetic means, said switch 'or breaker released inresponse to deenergization of said electro-magnetic means, and an'electiro magnetic switch controlling the circuit o'f saidelectro-magnetic means comprising two switches and a controllingelectro-magnet, the opening of either switch breaking said circuit todeenergize said 'electro magnetic means. a

16. In combination with a switch'or circuit breaker, of normallyenergized electromagnetic means, said switch or breaker released inresponse to deenergization of said electro-magnetic means, and anunderload or low voltage circuit breaker controlling the circuit of saidelectro-mag'netic means, said circuit breaker comprising two switches inseries, and an operatin member for opening one switch when it c oses theother.

17. In combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or breaker re leased inresponse to deenergization of said electro-magnetic means, and anunderload or low voltage circuit breaker controlling the circuit of saidelectro-magnetic means, said circuit breaker comprising two switches inseries, and an operating member for opening one switch when itcloses'the other means for mechanically restraining one of saidswitches, and the closure of the other of said switchestransferring therestraint of said first switch from said mechanical means to anelectro-magnet.

18. The combination with a switch or circuit breaker, of electromagneticmeans controlling the same, a control switch in the circuit of saidelectro-magnetic means controlled by means responsive to currentconditions in another circuit, and a second switch in the circuit ofsaid electromagnetic means restrained in circuit closing position by anormally energized electromagnet in said circuit, and means forrupturing said circuit when moving said switch to normal'position.

19. The combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, a controlswitch .intthe circuit of said electromotive device, an electro-magnetrestraining said switch in normal position, and means breaking thecircuit of said electro-magnet when said control switch is moved tonormal position, and a secondcontrol switch in the circuit of saidelectro-motive device controlled' by electro-responsive means in anothercircuit. 20. Thecoinbination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, acontrol-s'switch in the circuit of said electro- ;motive device, -anelectro-magnet restraining said switch in normal position, meansbreaking the circuit of said electromagnet when said control switch ismoved to'nonnal. position, means mechanically restraining said switch innormal position until said electro-magnet is energized, and a secondcontrol switch in the circuit of said electro-motive device controlledby electro-responsive means in another circuit.

21. The combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, saidelectro-motive device included in a normally closed circuit, meansresponsive to deenergization of said electro-motive device for releasingsaid switch or breaker, a control switch having a plurality ofindependently movable contact members controlling said circuit, and anelectro-magnet in said circuit, said electro-magnet restraining amovable contact member of said control switch in closed position whensaid circuit is closed, and a second control switch in the circuit ofsaid electro-motive device controlled by electro-responsive means inanother circuit.

22. The combination with a switch or circuit breaker, of anelectro-motive device for moving the same to normal position, saidelectro-motive device included in a nor mally closed circuit, meansresponsive to deenergization of said electro-motive device for releasingsaid switch or breaker, a control switch having contacts included insaid circuit, an electro-magnet in said circuit, said electro-magnetrestraining said control switch in closed position when said circuit isclosed, and means mechanically restraining said control switch in closedposition until said electro-magnet is ener-- gized, and a second controlswitch in the circuit of said electro-motive device controlled byelectro-responsive meansin another circuit.

23. The combination with a switch or circuit breaker, of aneiectro-motive device for moving the same to normal position, saidelectro-motive device included in a normally closed circuit, meansresponsive to deenergization of said electro-motive device for releasingsaid switch or breaker, a control switch having contacts included insaid circuit, an electro-magnet in said circuit, said electro-magnetrestraining said. control switch in closed position when saidvcontrolswitch is closed, and means mechanically restraining said control switchin closed position until said electro-magnet is energized, meansinterrupting said circuit when said control switch is mechanicallyrestrained and for closing said circuit to transfer the restraint ofsaid control switch to said electro-magnet, and a second control switchin the circuit of said electro-motive device controlled byelectro-responsive means in another circuit.

24. In combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or breaker r leased inresponse to denergization of said electro-magnetic means, an underloador low voltage circuit breaker controlling the circuit of saidelectro-magnetic means, a switch member breaking said circuit whenrestoring said underload or low voltage circuit breaker to normalposition, and a control switch in the circuit of said electromagneticmeans controlled by electro-responsive means in another circuit.

25. In combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or breaker released inresponse to deie'nergization of said electromagnetic means, an underloador low voltage circuit breaker controlling the circuit of saidelectro-magnetic means, said circuit breaker comprising two switches inseries, and an operating member for opening one switch when it closesthe other, and a control switch in the circuit of said electro-magneticmeans controlled by electroresponsive means in another circuit.

26. In combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or breaker released inresponse to deenergization of said electro-magnetic means, and anunderload or low voltage circuit breaker controlling the circuit of saidelectro-magnetic means, said circuit breaker comprising two switches inseries, and an operating member for opening one switch when it closesthe other, means for mechanically restraining one of said switches, andthe closure of the other of said switches transferring the restraint ofsaid first switch from said mechanical means to an electro-magnet, and acontrol switch in the circuit of said electro-magnetic means controlledby electroresponsive means in another circuit.

27. The combination with a switch or circuit breaker, of normallyenergized electromagnetic means adaptedto release said switch or circuitbreaker upon deenergization, a control switch for denergizing saide'lectro-magnetic means in response to electrical conditions in acircuit, a second control switch breaking the circuit of saidelect-ro-magnetic means in response to decreased current flow in thecircuit of said electromagnetic means, and'a manually operable memberfor resetting said second controlswitchand simultaneously breaking thecircuit of said electro-magnetic means.-

28; The combination with a switch or circuit breaker, .of normallyenergized electromagnetic means adapted to release said switch or,circuit breaker upon deenergization, a control switch for deenergizingsaid electro-magnetic means in response to electrial conditions in acircuit, and a second control Switch breaking the circuit of saidelectro-magnetic means in response to decreased current flow in thecircuit of said electro-magnetic means, said second control-switchcomprising a movable contact member and an independent actuator and anelectro-magnet, said actuator transferring said movable contact memberto the control of said electro-magnet when said actuator finally closessaid second control switch.

29. The combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or circuit breaker releasedin response to decnergization of said electro-magnetic means, andindependently movable contact members controlling the circuit of saidelectro-magnetic means, the actuation of one of said contact membersbreaking said circuit when moving another of said movable contactmembers to -32. The combination"with a switch or circuit breaker, ofnormally energized elect-ro magnetic means, said switch or circuitbreaker released in responseto 'deenergiza tion of said electro-magneticmeans, and an electro magnetic switch controlling'the circuit of said I-electro magnetic --means and comprising a plurality of switches and-'an elect'ro-magnet, 'said 'swi'tchesf adaptd to alternately; closethe-circuit of said'zelectroag etic meansgu 33. The 'combii'iationtwitha switchgor ird-nit Breaker, of morm'allj energized elem.

' tro -magnetic means, said sw'itchor breaker -electro-ma'gnetic:means:

released in response to de'energization of said elect-ro-magnetic means,'and a control switch in the circuit of said electro nagnetic means andcomprising a switch moved te circuit closing position by a me'mberlwhichsimultaneously breaks-the circuitf said '34. The combination with aswitch-or ci'rcuit breaker, of normally =energizedelectromagnetic means,saidswitch or circuit breaker released in response to 'denerg1za*' tionof said electro-magnet-ic'means, a conv trol switch in the circuit ofsaid electromagnetic means comprising a swltch moved to circuit closingposition by a member 'Copies of this patent may be obtained for fivecents each by addressing r Washington, D. C.

simultaneously breaking a circuit, and an electro-magnet for restrainingsaid switch in circuit closing position energized in response to returnmovement of said member.

35. The combination with a switch or circuit breaker, of normallyenergized electromagnetic means, said switch or circuit breaker releasedin response to'deenergization of said electro magnetic means, a controlswitchin' the circuit of said electro-magnetic'mea'ns comprising "aswitch moved to circuit closing'position by a member simultaneouslybreaking a circuit, an electro-magnet for restraining' said switch incircuit closing position energized in response to refifi'n movementof-said member, and means responsive to -current conditions in anothercircuit'forbreaking'the circuit of said electine-magnetic means.

ina'gnetic"mean's; s aid switch or breaker reas. The co "bination with aswitch or cirleasd in re'spon'se to 'deenergization of saidelectro-magnetic -means, a control switch in the eireuitvof saidelectro-magnetic means and comprising a switch moved to circuit closingposition by a member which simultaneously breaks the circuit ofsaidelectromagnetic means, and means responsive to electrical"conditions in another circuit for breaking the circuit-0f saidelectro-magnetic means. .3 Y 5 In testimony whereof I have hereunto'aflixed my signature in the presence of the two subscribing witnesses.I WILLIAM M. SCOTT.

Witnesses:

i E'rnnn L. FERGUSON,

'GERTRUDE MAHER.

the Commissioner of Patents.

